A look at the weighted underlying holdings of the First Trust Dow Jones Select MicroCap Index Fund (FDM) shows an impressive 10.7% of holdings on a weighted basis have experienced insider buying within the past six months. Start slideshow:10 ETFs With Stocks That Insiders Are Buying » Limbach Holdings Inc (LMB), which makes up 0.72% of the First Trust Dow Jones Select MicroCap Index Fund (FDM), has seen 2 directors and officers purchase shares in the past six months, according to the recent Form 4 data.